Shield for bearings.



Patented June 11, 1918.

C. H. J. DILG.

SHIELD FOR BEARINGS.

APPLICATION. man APR.26| 1915. RENEWED MAY 2, I9I8.

msmw,

it 4* ES H. J. DILG, 01* EYE, NEW YORK.

SHIELD FOB BEINGS.

Lasagna.

' Original application filed April 30, 1910, Serial No. 558,588. Divided 1915, Serial No. 24,011.

adapted for use with shafts having theirends adjacent to, or projecting beyond the ends of their bearings, such construction being common, as in electric motors, where the projecting part of the rotatable shaft carries a tool or fan, as is shown in my application Serial N 0. 558,588, filed April 30, 1910, of which case the present one is a division.

One of the objects of the invention is to provide a dust guard for protecting the contacting surfaces of the bearing and shaft from dust or dirt, which travels along the shaft and enters the bearing to increase the friction and wear between these parts. In accordance with this object the invention contemplates a disk which is mounted on the shaft in close proximity to the end of the bearing, which disk serves as a deflector to divert by centrifugal force, the dust which travels along the shaft, when it is rotating, away from the contacting surfaces of the bearing and shaft. The disk, when in rapid rotation, also acts like a fan and the current of air which it sets up prevents any dust and dirt from settling upon the end of the bearing or adjacent points of the shaft.

Another object of the invention is to provide a shield or guard which willprevent the oil which leaks out upon the end or the projecting portion of the shaft from being spattered on adjacent objects, tained by providing an annular chamber in the aforementioned disk which serves as an oil cup and catches the oil as it is thrown from the shaft by centrifugal force.

The invention is equally applicable to a construction in which the shaft is held stationary and supports a member which may be regarded as the equivalent of the bearing,

and which is adapted to rotate, in which instance the disk is mounted upon the rotatable member and has the same functions, serving as either a dust guard alone or as a combined dust and oil guard, when an annular chamber is provided in it.

Specification of Letters Patent.

and this is obwhich Patented June 111, rare.

and this application filed April 26,

Renewed May 2, 1918. Serial No. 232,157

In the accompanying drawings, the invention is illustrated in connection with the bearing forming a part of the motor casing of the electric motor shown in my parent application referred to, but this I type of bearing is shown for only and the invention is equally applicable to all forms of bearings in which the shaft ends with or projects beyond the end thereof.

Figure 1 of the drawing shows a central section through such a bearing and mounted upon the shaft is a combined oil and dust gugrd forming the basis of this invention; an

Fig. 2 is a plan on an enlarged scale of the guard removed fromthe shaft.

The shaft 1 which may be a continuationof an armature shaft, or driven in any other suitable manner, extends from the end of the bearing consisting of a sleeve. or box 2 surrounding the shaft, which sleeve is supported by and fitted into an opening in a rib 3 carried by the bearing caslng 4:. This casing-or shell is formed integral with the motor casing, not shown, and is provided with a substantially c lindrical extension or hub 5, whose end sur ace is provided with a suitable opening through which the shaft 1 projects. The sleeve 2 is maintained against rotation by a set screw 6 which is threaded into a suitable opening in the rih'3. I The sleeve 2 is provided with a recess or slot in its upper surface, in which an oil ring 7 rests, so that it bears directly upon the shaft and oil is fed into the bearing through an opening or passageway 8. In

the bottom of the bearing casing a reservoir 7 9 for the oil is provided, which leads through a slot or recess 10 in the rib 3 to an overflow pipe 11, which prevents the bearing from being flooded with the lubricant. The oil from theoverflow pipe is caught by a drip pan 12 depending from the lower portion of the hub 5, the construction described being similar to the bearing lid disclosed in the parent application aforesaid, and the particular construction of tion.

Referring now to the novel features of the invention,-mounted upon the shaft in close proximity to the end of the hub is a disk 13 which is preferably made of sheet metal and is attached to the shaft, bein fastened to the end of the shaft if the she does not is not essential to the present inven- Mitt if the shaft projects. In the lattercase,

which is the illustrated construction, the

disk is provided with a hub 14, which has an opening therein of a diameter suficient to receive the shaft 1, the hub 1 f being secured to the shaft in any suitable way, or the frictional engagement with the shaft may be sufficient to hold it in place. In that event the hub may be slotted as at 15, or otherwise formed so as to give it the necessary resiliency. The outer edge 16 of' the disk is turned over or curved to provide an annular chamber 17 which surrounds the end of the extension or hub 5 of the bearing, the outer edge of the disk being curved into close proximity to this hub so that the disk virtually forms a cap around the end of the bearing.

When the shaft is rotating rapidly, the particles of dust or dirt in the surrounding atmosphere are attracted to the shaft and tend to travel along the same and enter the space between the shaft and the hearing. The disk described prevents this dust from entering the bearing, since it is closely fitted around the shaft and will therefore act as a deflector, the particles of dust when reaching the disk being thrown off from the shaft by centrifugal force before they can enter the hearing. The fan action of the disk when the shaft is rotating, will also create a current of air which will prevent any 'of the particles of dust or dirt from settling on the end of the hearing, or upon the shaft adjacent to this point, the particles of dust being carried away from the hearing by the current of air which is produced. Moreover, any oil which leaks out of the bearing onto the projecting portion of the shaft will be thrown by centrifugal force into the annular chamber where it will be retained by centrifugal force until the shaft has stop ed rotating and if the annular chamher is filled with oil at this time the oil will menace gather in the lower portion of the annular chamber and overflow into the drip-pan. This annular chamber also serves as a dripcup and catches the oil droppin from the end face of the hearing if the hub of the bearing is fitted into the annular chamber,

although this is not important, since the ing rotatable shaft, yet it is apparent that if the shaft were stationary and supported a member similarto a bearing such as the hub of a pulley, the disk constituting the dust and oil guard could be fastened o the rotating hub, and still closely surround the shaft and obtain similar results as when it is used upon a rotating shaft, and it is intended that the term bearing will cover a construction in which the member which surrounds the shaft is the rotating part.

I claim: l

The combination with a bearing and shaft of a shield carried by the rotating part and comprising a disk having a. peripheral oilretaining chamber, said disk being mounted to receive oil escaping from'the bearing surfaces and to convey the same to the peripheral chamber. I

In witness whereof, I subscribe my signature, in the presence of two witnesses.

CHARLES J. nine.

Witnesses:

Vro'ron D. Boner, Wlmoo M. Charm. 

